[ksarul]

Steve, this is an interesting project from the standpoint of re-utilization of old cartridge boards. If you want to build larger cartridges, there are also other options. The Gerbers for the 64K bank-switched Guidry boards are available online, as are the Gerbers for the 512K variant that gives 4 128K bank-switched zones selectable by a pair of switches on the case. These two use the DataBioTics inverted switching method. For non-inverted switching, you can use the 512K boards I recently finished--or you can use one of the Über-GROM boards designed by Jon Guidry, Tursi, and I. Those should be available to the community at large in the very near future.

It is always good to see other people doing neat hardware experiments on the TI--and you can also find a lot of what is happening in the hardware world over on AtariAge in their TI subforum.

Jim

Recently, I built a 8K eprom cartridge to use the >6000 space available at the cartridge slot.
This space can be used for multiple purposes. You can clone a rare Rom based cartridge or write your own.
This project uses a spare TI Invaders cartridge, though there are a few others that will work as well.
If a socket is used on the board, different cartridge roms can be exchanged on the board to change applications easily. There are also 4 Grom spaces available, these can also have sockets installed and will allow up to 4 more titles on the menu along with the eprom at >6000
What's needed: a 2764 eprom(s) , a TI Invaders cartridge, optional sockets and either a eprom programmer, or a friend with one, along with soldering and desoldering skills and the necessary equipment to do it.
Dumps of Rom only cartridges are available online.

I created a PDF to help a fellow TI er build one, that I can make available here if possible. Otherwise, PM me and I'll send it to you.

Steve